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A few years ago, i was wrestling with an EtherTen locking up over time, though it was actually the W5100 chip, not the EtherTen as such.
With the help of this forum, i was pointed in the direction of a 555 based external reset circuit.
Having spent a few hours yesterday creating another external reset shield on a protoboard, it led me to Product idea 1.

2) An EtherTen 2. (Upgraded EtherTen)
Based on the Uno R3 + the equivalent of the Ethernet Shield 2 (W5500 chip) + a built in external reset circuit
and really pushing things a DC-DC converter as onboard voltage reg, saving further power.
The W5500 supports standby/sleep state for low power.

The combination of the above would allow to create an extremely low powered and 100% reliable remote monitoring solution.
The Ethernet module can then sleep until data needs to be sent / retrieved and then sleep again.

Thanks for the reply.
I obviously used the wrong search terms when i tried to find if something like the watchdog timer module existed. I had been searching for 555 and Shield, i hadn't thought to search for a simple external module. Great to know that it exists, i know what i am doing next time